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Atomization and Sprays

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ISSN Print: 1044-5110

ISSN Online: 1936-2684

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EFFECT OF NOZZLE DIAMETER ON MACROSCOPIC SPRAY BEHAVIOR OF HEAVY-DUTY DIESEL ENGINE UNDER COLD-START CONDITIONS

Volume 29, Issue 8, 2019, pp. 741-762
DOI: 10.1615/AtomizSpr.2020031776
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ABSTRACT

Nozzle diameters play a key role in the atomization and evaporation processes of diesel fuel. However, the influence of nozzle diameter on the spray characteristics of heavy-duty diesel engines rarely involves cold-start conditions, especially considering the coupling of the nozzle with the ambient temperature and fuel properties. Therefore, in this work, the macroscopic liquid- and vapor-phase spray behaviors of -50#, -35#, and -10# diesel fuels were measured at temperatures of 550-850 K by Mie-scattering and shadowgraph methods, respectively, in a constant volume combustion chamber. The results show that regardless of fuel properties the liquid spray from a 0.32-mm-diameter nozzle penetrates excessively due to the incapability in achieving a balance between injection and evaporation at low temperatures, which leads to a much longer penetration length compared with that of small nozzles with diameters of 0.12 and 0.22 mm. The up to 70 mm penetration at 750 K will lead to inevitable fuel wall/piston impingement under common cold-start conditions. Furthermore, compared with small nozzles, temperature reduction inhibits the spray evaporation of larger nozzles more significantly, which indicates a greater possibility of fuel/wall impingement in heavy-duty diesel engines. In addition, the penetration and spray area of the three fuels tested decreased in the order of -10#, -35#, and -50# diesel fuels due to their physical differences. Finally, based on the obtained experimental data, a new empirical correlation is established to provide a preliminary estimation of the liquid penetration length of heavy-duty diesel engines in low-temperature environments.

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CITED BY
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  2. Shi Zhicheng, Wu Han, Li Haiying, Zhang Lu, Li Xiangrong, Lee Chia-fon, Effect of injection pressure and fuel mass on wall-impinging ignition and combustion characteristics of heavy-duty diesel engine at low temperatures, Fuel, 299, 2021. Crossref

  3. Li Yaozong, Li Xiangrong, Cao Weiren, Shi Zhicheng, Bo Yaqing, Wu Han, Acting mechanism of low ambient temperature on wall-impinging diesel spray ignition at an extensive range, Fuel, 304, 2021. Crossref

  4. Bo Yaqing, Liu Fushui, Wu Han, Li Haiying, Shi Zhicheng, A numerical investigation of injection pressure effects on wall-impinging ignition at low-temperatures for heavy-duty diesel engine, Applied Thermal Engineering, 184, 2021. Crossref

  5. Wu Han, Cao Weiren, Li Haiying, Shi Zhicheng, Diao Yantao, Zhang Lu, Bo Yaqing, Li Xiangrong, Study on impinging ignition and wall-attached fuel film combustion characteristics of light- to heavy-duty diesel engines at low temperatures, Fuel, 313, 2022. Crossref

  6. Bo Yaqing, Wu Han, Hernández Juan J., Shi Zhicheng, Cao Weiren, Li Xiangrong, Numerical study of wall-impinging ignition at different wall distances for cold start of heavy-duty diesel engine, Applied Thermal Engineering, 212, 2022. Crossref

  7. Wu Han, Sun Long, Shi Zhicheng, Li Haiying, Zhang Lu, Bo Yaqing, Cao Weiren, Li Xiangrong, Effect of wall parameters on impinging combustion and soot emission characteristics of heavy-duty diesel engine at low temperature, Chemosphere, 306, 2022. Crossref

  8. Wu Han, Dong Xinyi, Shi Zhicheng, Li Haiying, Miao Sheng, Cao Weiren, Bo Yaqing, Zhang Lu, Li Xiangrong, Evolution mechanism of diesel ignition with injection pressure under different spray wet-wall conditions at low temperatures, Fuel, 330, 2022. Crossref

  9. Shi Zhicheng, Cao Weiren, Wu Han, Li Haiying, Zhang Lu, Bo Yaqing, Li Xiangrong, Research on destructive knock combustion mechanism of heavy-duty diesel engine at low temperatures, Combustion Science and Technology, 2022. Crossref

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